*{
    /* 去除内外边距 */
    margin: 0;
    padding: 0;
}

/* 整体游戏容器样式 */
.container{
    width: 600px;
    height: 600px;
    background: #225675;
    border: 20px solid #7dd9ff;
    margin: 20px auto;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

/* 按钮公共样式 */
.container button{
    border: none;
    outline: none;
}

/* 开始按钮 */
.startBtn{
    width: 200px;
    height: 80px;
    background: url(/img/startBtn.png) center/contain no-repeat;
    display: none;
}

/* 暂停按钮 */
.pauseBtn{
    width: 200px;
    height: 80px;
    background: url(/img/pauseBtn.jpg) center/contain no-repeat;
    display: none;
}
